[Rails] Re: Hook into Exception Chain

Hi Jeff, thanks for your reply!

I found the article here:

http://www.simonecarletti.com/blog/2009/11/re-raise-a-ruby-exception-in-a-rails-rescue_from-statement/

And he mentions that re-raising does not work since rails won't catch it anymore..

has this been changed since?

I generally thought there might be a better way, as usually re-raising exceptions is considered to be bad :)

Thanks a lot,

Christoph

On Tuesday, 12 November 2013 19:07:00 UTC+1, Jeff Lewis wrote:

Hi Christoph,

All you need to do is re-raise the exception after you're done using it in your rescue_from, so something along the lines of:

$ cat ./app/controllers/foo_controller.rb

...

  rescue_from Exception do |e|

    # do something with e before re-raising it ...

    Rails.logger.debug("TEST: before re-raising ... e=#{e.inspect}")

    raise e

  end

...

  def testfoo

    x = 'bar' if 1/0

    ....

  end

....

$ curl -sLi http://foo.localhost/testfoo

...

$ cat ./log/development.log

...

[c55f5] TEST: before re-raising ... e=#<ZeroDivisionError: divided by 0>

[c55f5] Completed 500 Internal Server Error in 17ms

[c55f5]

ZeroDivisionError (divided by 0):

  app/controllers/foo_controller.rb:89:in `/'

  app/controllers/foo_controller.rb:89:in `testfoo'

...

Jeff

On Tuesday, November 12, 2013 6:40:12 AM UTC-8, sol wrote:

Hi there,

I'm using Log4r in my rails projects. On log.error an email is sent using the EmailOutputter.

I know changed the EmailOutputter to include a global var in the subject (MDC) since the subject is normally static.

I want to set this var to the exception message, so it is sent as the subject.

Can anyone tell me how to do this in rails?

Basically:

raise e or some other cause
-> Log4r::MDC.put('subject', e.message)
continue with the exception

I found rescue_from but it just gives it to the handler and then stops.

Thanks a lot,

Christoph

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